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ST7LITE49K2 データシート(PDF) 63 Page - STMicroelectronics |
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ST7LITE49K2 データシート(HTML) 63 Page - STMicroelectronics |
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63 / 245 page  ST7LITE49K2 Power saving modes 63/245 9 Power saving modes 9.1 Introduction To give a large measure of flexibility to the application in terms of power consumption, four main power saving modes are implemented in the ST7 (see Figure 24): ● Slow ● Wait (and Slow-Wait) ● Active-halt ● Auto-wakeup from Halt (AWUFH) ● Halt After a reset the normal operating mode is selected by default (Run mode). This mode drives the device (CPU and embedded peripherals) by means of a master clock which is based on the main oscillator frequency (fOSC). From Run mode, the different power saving modes may be selected by setting the relevant register bits or by calling the specific ST7 software instruction whose action depends on the oscillator status. Figure 24. Power saving mode transitions POWER CONSUMPTION Wait Slow Run Active Halt High Low Slow Wait Halt |
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